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Cellulose/boron nitride core-shell microbeads providing high thermal conductivity for thermally conductive composite sheets

机译：纤维素/氮化物芯 - 壳微珠，为导热复合板提供高导热率

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摘要

We fabricated sheets with high thermal conductivity in a way that required less filler. Our approach is as follows: (1) we used core-shell spherical microbeads as the thermally conductive filler; (2) we developed cellulose/h-boron nitride (BN) core-shell spherical microbeads using phase separation of a cellulose xanthate aqueous solution (viscose); (3) we hybridized the cellulose/h-BN core-shell microbeads with epoxy resin using compression molding. This process reduced the amount of h-BN required because the microbeads efficiently formed thermally conductive pathways among the shells in the insulating resin. The thermal conductivities of the resulting sheet in the thickness and in-plane directions were 10.6 and 15.6 W m(-1) K-1, respectively, using only 48.5 vol% h-BN. In contrast, the thermal conductivities of the composite sheet with 75 vol% of naked h-BN particles were 6.31 and 22.9 W m(-1) K-1 in the thickness and in-plane directions, respectively. This large difference resulted from the anisotropic structure of h-BN. The changes in thermal conductivity with h-BN content were inconsistent with percolation theory, when using the cellulose/h-BN core-shell microbeads as a filler. The thermally conductive sheets fabricated with microbeads exhibited thermal conductivities several times greater than that of sheets fabricated with naked h-BN. This indicated that thermally conductive pathways had formed in the insulating resin.
机译：我们以较少的方式制造具有高导热率的薄片。我们的方法如下：（1）我们使用核心壳球形微珠作为导热填料; （2）我们使用纤维素黄原酸盐水溶液（粘胶）的相分离产生纤维素/ H-硼氮化物（BN）核心 - 壳球形微珠; （3）我们使用压缩模塑杂交用环氧树脂杂交纤维素/ H-BN核心壳微珠。该过程减少了所需的H-BN的量，因为微珠有效地形成绝缘树脂中的壳中的导热途径。使用48.5Vol％H-BN，厚度和面内方向上的所得片材的热导体分别为10.6和15.6Wm（-1）k-1。相反，复合片材的热导体分别具有75体积％的裸H-BN颗粒的厚度和面内方向的6.31和22.9Wm（-1）k-1。这种大的差异是由H-BN的各向异性结构产生的。当使用纤维素/ H-BN核心 - 壳微珠作为填料时，与H-BN含量的热导率的变化与渗透理论不一致。用Microbead制造的导热片显示出与用裸H-BN制造的片材的热导体大于多倍。这表明在绝缘树脂中形成了导热途径。

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  • 来源
    《RSC Advances》 |2016年第39期|共7页
  • 作者

    Nagaoka Shoji; Jodai Takuma; Kameyama Yoshihiro; Horikawa Maki; Shirosaki Tomohiro; Ryu Naoya; Takafuji Makoto; Sakurai Hideo; Ihara Hirotaka;

  • 作者单位

    Kumamoto Ind Res Inst Higashi Ku 3-11-38 Higashi Machi Kumamoto 8620901 Japan;

    Ogic Technol Co Ltd Nishi Ku 2-9-9 Kami Kumamoto Kumamoto 8608555 Japan;

    Kumamoto Univ Dept Appl Chem &

    Biochem Chuo Ku 2-39-1 Kurokami Kumamoto 8608555 Japan;

    Kumamoto Ind Res Inst Higashi Ku 3-11-38 Higashi Machi Kumamoto 8620901 Japan;

    Kumamoto Ind Res Inst Higashi Ku 3-11-38 Higashi Machi Kumamoto 8620901 Japan;

    Kumamoto Ind Res Inst Higashi Ku 3-11-38 Higashi Machi Kumamoto 8620901 Japan;

    Kumamoto Univ Dept Appl Chem &

    Biochem Chuo Ku 2-39-1 Kurokami Kumamoto 8608555 Japan;

    Kumamoto Univ Dept Appl Chem &

    Biochem Chuo Ku 2-39-1 Kurokami Kumamoto 8608555 Japan;

    Kumamoto Univ Dept Appl Chem &

    Biochem Chuo Ku 2-39-1 Kurokami Kumamoto 8608555 Japan;

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  • 正文语种 eng
  • 中图分类 化学;
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